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PROTECTION PRODUCTS - RailClamp Description
RailClamps are surge rated diode arrays designed to protect high speed data interfaces. The RClamp series has been specifically designed to protect sensitive components which are connected to data and transmission lines from overvoltage caused by ESD (electrostatic discharge), CDE (cable discharge events), EFT (electrical fast transients), and lightning. The unique design of these devices incorporates surge rated, low capacitance steering diodes and a TVS diode in a single package. During transient conditions, the steering diodes direct the transient to either the positive side of the power supply line or to ground. The internal TVS diode prevents over-voltage on the power line, protecting any downstream components. The RClampTM0508M has a low typical capacitance of 3pF and may be used on lines operating up to 1GHz. This makes the device ideal for protection of highspeed data lines such as USB 2.0, Firewire, DVI, and gigabit Ethernet interfaces. The low capacitance array configuration allows the user to protect eight high-speed data or transmission lines. The low inductance construction minimizes voltage overshoot during high current surges. They may be used to meet the ESD immunity requirements of IEC 61000-4-2, Level 4 (15kV air, 8kV contact discharge).
RailClamp Low Capacitance TVS Diode Array
Features
ESD protection for high-speed data lines to IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns) IEC 61000-4-5 (Lightning) 12A (8/20s) Array of surge rated diodes with internal TVS Small package saves board space Protects eight I/O lines operating up to 1GHz Low capacitance: 3pF typical Low clamping voltage Low operating voltage: 5.0V Solid-state silicon-avalanche technology
RClamp0508M
Mechanical Characteristics
JEDEC MSOP-10L package Molding compound flammability rating: UL 94V-0 Marking : Marking code and date code Packaging : Tape and Reel per EIA 481 Lead Finish: Matte Tin
Applications
USB 2.0 Power & Data Line Protection Video Graphics Cards Monitors and Flat Panel Displays Digital Video Interface (DVI) High Definition Multi-Media Interface (HDMI) 10/100/1000 Ethernet ATM Interfaces IEEE 1394 Firewire Ports
Circuit Diagram
PIN Configuration
3
Line 1 1 Line 2
1 2 4 5 7 8 9 10
Line 8 Line 7 Line 6 Line 5 GND
Vcc Line 3 Line 4
6
MSOP-10L (Top View)
Revision 01/18/2008 1 www.semtech.com
RClamp0508M
PROTECTION PRODUCTS Absolute Maximum Rating
R ating Peak Pulse Power (tp = 8/20s) Peak Pulse Current (tp = 8/20s) ESD per IEC 61000-4-2 (Air) ESD per IEC 61000-4-2 (Contact) Lead Soldering Temperature Operating Temperature Storage Temperature Symbol Pp k IP P VESD TL TJ TSTG Value 300 12 15 8 260 (10 sec.) -55 to +125 -55 to +150 Units Watts A kV C C C
Electrical Characteristics (T=25oC)
Parameter Reverse Stand-Off Voltage Reverse Breakdown Voltage Reverse Leakage Current Forward Voltage Clamp ing Voltage Clamp ing Voltage Clamp ing Voltage Junction Cap acitance Symbol VRWM V BR IR Vf VC VC VC Cj Conditions Pi n 3 to 6 It = 1mA Pi n 3 to 6 VRWM = 5V, T=25C Pi n 3 to 6 If = 15mA IPP = 1A, tp = 8/20s Any I/O p in to Ground IPP = 5A, tp = 8/20s Any I/O p in to Ground IPP = 12A, tp = 8/20s Any I/O p in to Ground VR = 0V, f = 1MHz Any I/O p in to Ground VR = 0V, f = 1MHz Between I/O p ins 3 1.5 6 5 1.2 12.5 17.5 25 5 Minimum Typical Maximum 5 Units V V A V V V V pF pF
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RClamp0508M
PROTECTION PRODUCTS Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time
10
110 100 % of Rated Power or IPP 90 80 70 60 50 40 30 20 10 0
Power Derating Curve
Peak Pulse Power - PPP (kW)
1
0.1
0.01 0.1 1 10 Pulse Duration - tp (s) 100 1000
0
25
50
75
100
125
150
Ambient Temperature - TA (oC)
Pulse Waveform
110 100 90 80 70 60 50 40 30 20 10 0 0 5 10 15 Time (s) 20 25 30 td = IPP/2
PP
Clamping Voltage vs. Peak Pulse Current
Waveform Parameters: tr = 8s td = 20s
30.00 Clamping Voltage -Vc (V) 25.00 20.00 15.00 10.00 5.00 0.00 0.00 Waveform Parameters: tr = 8s td = 20s 2.00 4.00 6.00 8.00 10.00 12.00
Percent of I
e-t
Peak Pulse Current - Ipp (A)
Forward Voltage vs. Forward Current
2
Normalized Capacitance vs. Reverse Voltage
7.00 Forward Voltage -VF (V) 6.00 5.00 4.00 3.00 2.00 1.00 0.00 0.00 Waveform Parameters: tr = 8s td = 20s
CJ(VR) / C J(V R=0)
1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 1 2 3 4 f = 1 MHz 5
2.00
4.00
6.00
8.00
10.00
12.00
Forward Current - IF (A)
Reverse Voltage - VR (V)
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RClamp0508M
PROTECTION PRODUCTS Typical Characteristics (Con't)
Insertion Loss S21
CH1 S21 LOG 3 dB/ REF 0 dB
Analog Cross Talk
CH1 S21 LOG 20 dB/ REF 0 dB
START
.030 000 MHz
STOP 3 000. 000 000 MHz
START
.030 000 MHz
STOP 3 000. 000 000 MHz
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RClamp0508M
PROTECTION PRODUCTS Applications Information
Device Connection Options for Protection of Eight High-Speed Data Lines This device is designed to protect eight data lines from transient over-voltages by clamping them to a fixed reference. When the voltage on the protected line exceeds the reference voltage (plus diode VF) the steering diodes are forward biased, conducting the transient current away from the sensitive circuitry. Data lines are connected at pins 1, 2, 4, 5, 7, 8, 9, and 10. The negative reference is connected at pin 6. This pin should be connected directly to a ground plane on the board for best results. The path length is kept as short as possible to minimize parasitic inductance. The positive reference is connected at pin 3. The options for connecting the positive reference are as follows: 1. To protect data lines and the power line, connect pin 3 directly to the positive supply rail (VCC). In this configuration the data lines are referenced to the supply voltage. The internal TVS diode prevents over-voltage on the supply rail. 2. In applications where the supply rail does not exit the system, the internal TVS may be used as the reference. In this case, pin 3 is not connected. The steering diodes will begin to conduct when the voltage on the protected line exceeds the working voltage of the TVS (plus one diode drop). Universal Serial Bus ESD Protection The RClamp0508M may be used to protect USB 2.0 ports on monitors, computers, peripherals or portable systems. Each device will protect up to four USB ports. When the voltage on the data lines exceed the bus voltage (plus one diode drop), the internal rectifiers are forward biased conducting the transient current away from the protected controller chip. The TVS diode directs the surge to ground. The TVS diode also acts to suppress ESD strikes directly on the voltage bus. Thus, both power and data pins are protected with a single device.
3
Schematic
1
2
4
5
7
8
9
10
6
Pin Configuration
Line 1 1 Line 2 Vcc Line 3 Line 4 Line 8 Line 7 Line 6 Line 5 GND
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RClamp0508M
PROTECTION PRODUCTS Applications Information
ESD Protection With RailClamps RailClamps are optimized for ESD protection using the rail-to-rail topology. They are designed to overcome the inherent disadvantages of using discrete signal diodes for ESD suppression. The RailClamp's integrated TVS diode helps to mitigate the effects of parasitic inductance in the power supply connection. During an ESD event, the current will be directed through the integrated TVS diode to ground. The maximum voltage seen by the protected IC due to this path will be the clamping voltage of the device. The line loading capacitance is minimized by using low capacitance steering diodes. The steering diodes are scaled to handle high current ESD events without damage or degradation. The end result is a highly reliable, integrated solution that eliminates the guess work associated with using discrete components. Matte Tin Lead Finish Matte tin has become the industry standard lead-free replacement for SnPb lead finishes. A matte tin finish is composed of 100% tin solder with large grains. Since the solder volume on the leads is small compared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be determined by the requirements of the solder paste. Therefore, these devices are compatible with both lead-free and SnPb assembly techniques. In addition, unlike other lead-free compositions, matte tin does not have any added alloys that can cause degradation of the solder joint. Rail-T Pro Rail-To-Rail Pr o t ection Using RailClamp Arrays RailClam p T V S Arra ys
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RClamp0508M
PROTECTION PRODUCTS Applications Information - SPICE Model
1.0 nH I/O Line
nH
RClamp0508M Spice Model
R Clamp0508M Spice Parameters Parameter IS BV VJ RS IB V CJO TT M N EG Unit A mp Volt Volt Ohm Amp Farad sec --eV D1 (LCR D) 10E-14 180 0.62 0.31 1E-3 3E-12 2.541E-9 0.01 1.1 1.11 D2 (LCR D) 10E-14 20 0.59 0.37 1E-3 1E-12 2.541E-9 0.01 1.1 1.11 D3 (T VS) 10E-14 8.59 0.6 0.500 1E-3 360E-12 2.541E-9 0.334 1.1 1.11
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RClamp0508M
PROTECTION PRODUCTS Outline Drawing SO-8 Outline Drawing -- MSOP 10L
e A N 2X E/2 PIN 1 INDICATOR ccc C 2X N/2 TIPS 12 B E1 E H GAGE PLANE 0.25 (L1) D aaa C SEATING PLANE A2 C A1 bxN bbb C A-B D A DETAIL L c SIDE VIEW SEE DETAIL D
DIM
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.043 .000 .006 .030 .037 .007 .011 .003 .009 .114 .118 .122 .114 .118 .122 .193 BSC .020 BSC .016 .024 .032 (.037) 10 0 8 .004 .003 .010 1.10 0.00 0.15 0.75 0.95 0.17 0.27 0.08 0.23 2.90 3.00 3.10 2.90 3.00 3.10 4.90 BSC 0.50 BSC 0.40 0.60 0.80 (.95) 10 0 8 0.10 0.08 0.25
A
01
A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc
A
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MO-187, VARIATION BA.
Land Pattern - MSOP 10L
X
DIM
(C) G Z C G P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.161) .098 .020 .011 .063 .224 (4.10) 2.50 0.50 0.30 1.60 5.70
Y P
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
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RClamp0508M
PROTECTION PRODUCTS Marking Codes
508M XXXX
* XXXX = Date Code ** Dot indicates Pin 1
Ordering Information
Part Number RClamp 0508M.TBT Working Voltage 5V Qty per Reel 500 R eel Size 7 Inch
Note: Lead finish is lead free matte tin
RailClamp and RClamp are marks of Semtech Corporation
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
2008 Semtech Corp. 9 www.semtech.com

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